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   <div id="projectbrief">Generic and Reusable Parallel Pattern Interface</div>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_09623dfa51a61b2fbf8544d2a5f9ce36.html">tbb</a></li>  </ul>
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<a href="tbb_2farm_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#ifndef GRPPI_TBB_FARM_H</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define GRPPI_TBB_FARM_H</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#ifdef GRPPI_TBB</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="parallel__execution__tbb_8h.html">parallel_execution_tbb.h</a>&quot;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &lt;experimental/optional&gt;</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">#include &lt;tbb/tbb.h&gt;</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrppi.html">grppi</a> {</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Generator, <span class="keyword">typename</span> Consumer&gt;</div><div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="group__farm__pattern__tbb.html#ga22706960fdf85a22ae0320becab1ed7d">   52</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">farm</a>(<a class="code" href="classgrppi_1_1parallel__execution__tbb.html">parallel_execution_tbb</a> &amp; ex, Generator generate_op, </div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;          Consumer consume_op) </div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;{</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  <span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;  <span class="keyword">using</span> generated_type = <span class="keyword">typename</span> result_of&lt;Generator()&gt;::type;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  <span class="keyword">auto</span> queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#aa06e47a8d52617c761600c0e97db5055">make_queue</a>&lt;generated_type&gt;();</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;  tbb::task_group g;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    g.run([&amp;](){</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;      <span class="keyword">auto</span> item{queue.pop()};</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;      <span class="keywordflow">while</span> (item) {</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        consume_op(*item);</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        item = queue.pop();</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;      }</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    });</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  }</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  <span class="comment">//Generate elements</span></div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  <span class="keywordflow">for</span> (;;) {</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="keyword">auto</span> item{generate_op()};</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    queue.push(item);</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;      <span class="keywordflow">if</span> (!item) {</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); i++) {</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;          queue.push(item);</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        }</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        <span class="keywordflow">break</span>;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;      }</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    }</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="comment">//Join threads</span></div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    g.wait();</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;}</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Generator, <span class="keyword">typename</span> Transformer, <span class="keyword">typename</span> Consumer&gt;</div><div class="line"><a name="l00099"></a><span class="lineno"><a class="line" href="group__farm__pattern__tbb.html#ga0d5b892e1b65020c375e19e62d0f9bf7">   99</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">farm</a>(<a class="code" href="classgrppi_1_1parallel__execution__tbb.html">parallel_execution_tbb</a> &amp; ex, Generator generate_op, </div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;          Transformer transform_op, Consumer consume_op) </div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;{</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;  <span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;  <span class="keyword">using namespace </span>experimental;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  <span class="keyword">using</span> generated_type = <span class="keyword">typename</span> result_of&lt;Generator()&gt;::type;</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  <span class="keyword">using</span> generated_value_type = <span class="keyword">typename</span> generated_type::value_type;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;  <span class="keyword">using</span> transformed_value_type = </div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;      <span class="keyword">typename</span> result_of&lt;Transformer(generated_value_type)&gt;::type;</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;  <span class="keyword">using</span> transformed_type = optional&lt;transformed_value_type&gt;;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;  <span class="keyword">auto</span> generated_queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#aa06e47a8d52617c761600c0e97db5055">make_queue</a>&lt;generated_type&gt;();</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;  <span class="keyword">auto</span> transformed_queue = ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#aa06e47a8d52617c761600c0e97db5055">make_queue</a>&lt;transformed_type&gt;();</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  atomic&lt;int&gt;done_threads{0};</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  tbb::task_group generators;</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    generators.run([&amp;](){</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;      <span class="keyword">auto</span> item{generated_queue.pop()};</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;      <span class="keywordflow">while</span> (item) {</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        <span class="keyword">auto</span> result = transform_op(*item);</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;        transformed_queue.push(transformed_type{result});</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        item = generated_queue.pop();</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;      }</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;      done_threads++;</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;      <span class="keywordflow">if</span> (done_threads==ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>()) {</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;        transformed_queue.push(transformed_type{});</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;      }</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    });</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;  }</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;  thread consumer_thread([&amp;](){</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <span class="keyword">auto</span> item {transformed_queue.pop()};</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    <span class="keywordflow">while</span> (item) {</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;      consume_op(*item);</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;      item = transformed_queue.pop(  );</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    }</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;  });</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;   <span class="comment">//Generate elements</span></div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  <span class="keywordflow">for</span> (;;) {</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    <span class="keyword">auto</span> item = generate_op();</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    generated_queue.push(item) ;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    <span class="keywordflow">if</span>(!item) {</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;      <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;        generated_queue.push(item) ;</div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;      }</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;      <span class="keywordflow">break</span>;</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    }</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;  }</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;  generators.wait();</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;  consumer_thread.join();</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;}</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;}</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="namespacegrppi_html"><div class="ttname"><a href="namespacegrppi.html">grppi</a></div><div class="ttdef"><b>Definition:</b> callable_traits.h:24</div></div>
<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdoc">STL namespace. </div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__tbb_html_aa06e47a8d52617c761600c0e97db5055"><div class="ttname"><a href="classgrppi_1_1parallel__execution__tbb.html#aa06e47a8d52617c761600c0e97db5055">grppi::parallel_execution_tbb::make_queue</a></div><div class="ttdeci">mpmc_queue&lt; T &gt; make_queue() const </div><div class="ttdoc">Makes a communication queue for elements of type T. Constructs a queue using the attributes that can ...</div><div class="ttdef"><b>Definition:</b> parallel_execution_tbb.h:105</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__tbb_html"><div class="ttname"><a href="classgrppi_1_1parallel__execution__tbb.html">grppi::parallel_execution_tbb</a></div><div class="ttdoc">TBB parallel execution policy. </div><div class="ttdef"><b>Definition:</b> parallel_execution_tbb.h:37</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__tbb_html_a4658679d34e759c78eed069d60aa8f8b"><div class="ttname"><a href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">grppi::parallel_execution_tbb::concurrency_degree</a></div><div class="ttdeci">int concurrency_degree() const noexcept</div><div class="ttdoc">Get number of grppi trheads. </div><div class="ttdef"><b>Definition:</b> parallel_execution_tbb.h:73</div></div>
<div class="ttc" id="parallel__execution__tbb_8h_html"><div class="ttname"><a href="parallel__execution__tbb_8h.html">parallel_execution_tbb.h</a></div></div>
<div class="ttc" id="group__farm__pattern_html_ga26bdb7c1b6c3d4bedbcfc1774d00833c"><div class="ttname"><a href="group__farm__pattern.html#ga26bdb7c1b6c3d4bedbcfc1774d00833c">grppi::farm</a></div><div class="ttdeci">auto farm(Execution &amp;ex, Transformer &amp;&amp;transform_op)</div><div class="ttdoc">Invoke Farm pattern on a data stream that can be composed in other streaming patterns. </div><div class="ttdef"><b>Definition:</b> farm.h:51</div></div>
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